Bizarrely, I have never personally run the Lucas formula so I’m not the guy to answer that one I’m afraid. Always been meaning to try it one day but just haven’t gotten around to it.
I run a bottled nutrient line from a Canadian company called Green Planet. It’s their 3 part GP3 line, plus additives. I really like it and I’ve had plenty of delicious results, but my first run in DWC I really struggled with learning a new style of growing and reading the plants correctly. Didn’t help that I’d been outta the game for over 15 years, had to put my training wheels back on!
The thing is I thought I was starting out pretty conservatively by running them at half strength. I just didn’t have any idea at the time how truly efficient uptake can be on a deep water system. With the roots in the nutes the whole time they just suck the food up like a pig at a trough, and before I knew it I was burning them pretty bad.
Of course, out of practice and alone, I totally misread the signs as a defficiency and upped the feed like an idiot. Yep, made it worse.
It’s a bit of a read but I went off on this a while back in my grow thread…
About halfway through that long ass post, after this…
That’s about my whole take on it if you want, but I’m sure somebody around here that has experience with Lucas will chime in.